Read about the legal terms and disclosures you must add to an Illinois real estate purchase agreement. Learn what required information you must include.A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. Seller shall also furnish Purchaser with: (i) an Affidavit of Title in customary form; (ii) a Bill of. A Sales and Purchase Agreement (SPA) is a legal contract that details the agreement's terms and conditions. Download an Illinois residential purchase agreement template to define buyer and seller obligations, financing, and inspections. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer. A long form agreement for the purchase and sale of commercial real property in Illinois.